I'm just wondering if anyone knows what the differences are between the 38mm Tial wastegate and the 44mm wastegate other than the valve size.

Are the frames the same and they can use the same springs?

I found a un-used RED 44mm Tial WG for sale and i have a SILVER 38mm and i'm just wondering if i'm able to swap the tops halves of the waste gates.

thanks for the help.

The springs are interchangeable, the tops are not.