Oil pans for slant 6 motors

I hear a lot of people say that the Oil pans for the 225 Slant6 will interchange with each other. Is that true?
The reason I'm asking is because the slant6 motor that is in my 68 valiant has an oil pan with the drain plug on the side of it and the hump is set back like 7 inches or so from the front of the block.
The Slant6 motor I am rebuilding has the oil pan drain plug on the back side of it and the hump is only 5 inches or so from the front of the block. I hope using this oil pan with the motor I am rebuilding will clear the crossmember. It looks like it might be kind of close.