Here are the differences between the Hasbro and TakTOM versions according to TFwiki. TFwiki has this information spread across different pages (for each character's relevant toy page), so I thought I'd just collate and put them here for easy/quick reference.

* Different packaging (Thrilling 30) and instructions. Instructions do not explain any of the accessories, action or interactive features w/ cassettes.
* Soundwave's visor is yellow instead of red
* Rumble/Frenzy gun storage panels on feet are unpainted
* Cut out images for display panel not included
* Microcassette cases are clear transparent instead of hot pink
* Laserbeak has a brighter shade of red.
* Buzzsaw is a brighter yellow instead of amber.
* Ravage has a different shade of grey.
* Rumble has a brighter shade of red, and has painted gold decos instead of gold chrome.
* Frenzy has a brighter shade of purple and blue, and painted silver decos instead of silver chrome.