Need help identifying CMB engine

[Dr Hydro]

I bought the second engine hoping to have a replacement for the first one but it is slightly different. Were there 2 generations of the CMB 65 Gran Prix engine and are the piston and liner interchangeable? Thanks for any info. Jim Fullmer

 

[wayne middlemiss]

pic's would help your request . grand prix, grand prix 2., gold head evolution grand prix version????

 

[Dr Hydro]

pic's would help your request . grand prix, grand prix 2., gold head evolution grand prix version????

oooops. I thought I attached the pics. Will try again tomorrow.