GM Muncie 318 different Side Covers ???

[Nils]

Hello,
I have a 1966 C10 Long Bed Truck with the 283 V8 and the 3 on the tree Tranny.
Now my GM 318 is broken and i need a new one. On ebay.com i have found a rebuild one thats looks great. Its a 318 like my. Only 2 Thinks are different. The Side Cover is a little bit rounder and on the case there is a different to. You can see it at the picture.
Is this a problem ? Or can i take this Tranny and put it in my Truck ???

Thank you all verry verry much.

Greats Nils