Warning: Information Overload

WARNING: 
The following answer deals with history and reality and gets very long-winded, and is specifically worded to educate in a detailed manor. But with a smile.☺

Ready?
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A very commonly asked question that we still get almost daily is:
* What is the difference between the Tow Sled Shark and the Platform sharks?
I could spend the rest of the week answering this question. 
In addition I would add, 
"What are the differences between the above listed sharks and the 4th Bruce Shark, The Studio Tank Bruce [Hooper cage attack Bruce]?"
To this add in what are the myriad of differences between the early Tow Sled Shark and the final variation used for pick up shots back in California. 
And to this also list the mind numbing amount of differences between all the different Bruce sharks as sections of their skins were patched and replaced with varying thick nesses of foam backing and/or frame modifications were implemented etc...
So generally speaking yes, all the sharks were from the same sectional molds.
But no, they were all different sharks due to being stretched over differently framed, and differently segmented structures. 
Prime Illustration being that of how a rubber glove might look on a heavy person's hand as opposed to a slim person's hand. Because different things are not the same.
** Please stop here if that's answer enough for you **
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This my friends it the prime reason that others never got Bruce museum quality and scale-model accurate like we have for over 2 dozen different Bruce Shark products provided by the thousands globally all decade. 
Because in all honestly scale models are NOT the same as just anybody's artistic interpretation. Artistic interpretation is why a Walmart toy F-15 jet doesn’t match up to a real F-15 jet. Things that are not the same are different. But scale modeling provides reality via research material and extreme measuring. 
So the historically accurate display model is simply mathematically correct in that scale.
Who could count how many people have taken a few favorite Jaws photos and tried to make their sculpt look like them as much as possible? Even though their few favorite photos are of entirely different sharks used almost a year apart! Nothing wrong with this approach, IF that's your published goal.
Nobody needs to get hurt feelings over such a plain and kind explanation of reality.
If that’s someone’s best then so be it, but that is not museum quality nor historically-scale-accurate.
Our background is providing museum displays and practical FX. So we have a lifetime of experience invested into replicating historical-reality as it really was. I’m almost 50 and I made my first functioning mechanical shark almost 40 years ago... Experience shows just as much as a lack of it does.
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I tried to explain this even more kindly back in 2006 on a fan forum but a certain 'Jaws collector' backing another artist's product twisted this educational share into a socially failed attempt to hide our sharks from the fan community. 
Any guesses who that loser was/is? 
Like Pinky & the Brain he’s still trying to take over the world of Jaws fans to this day. Seriously...
Yet here we are over a decade later providing more scale-perfect sharks globally than anyone in all of history. Treating fans as close friends and investing in a better shark runs circles around manipulative-politicking any day of the week. Yes, I said it.
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Regardless, here is one photo that should really help people see how different the Tow Sled Shark is from the other Bruce Sharks. Math and fine-scale measuring tells the truth, the whole truth and nothing but the truth. 
Others will undoubtedly still attempt to copycat and rip off our vast body of invested research and many successful products and accessories. But our sharks have been right all along and are even more right today thanks mostly to those that actually built the sharks befriending and assisting us in our passion to improve them and to share the fun. 
It’s all in the shark. 
Bottom line, look at our product photos and pick the shark that you love best as Bruce knowing that we took the material seriously and provided historical-scale-accuracy. Or collect them all while we are still providing them. Easy as pie. Now there's a win-win☺!
I hope this scratches all itches involved. Bruce LIVES!
Thank you my friends.