thomas and friends mini series

If you opened them up... do the classic engines look the same as they did in the 2015 release, or are there any new details or changes? I wasn't planning on getting any of the engines we already had but I don't want to miss out on any new-and-improved engines.

I only purchased the new ones. I have far to many "spares" or twins as my daughter calls them as is.

Although if I can get a 3D printer past the wife, I have a few ideas for the extras to turn a little profit.