Yes, the covers are interchangeable (make sure it clears your HEI). The timing cover as well. The later, 11-bolt cover uses one divider plate, and also sleeve inserts in the two passages that connect to the block passages on either side of the cam gear.
The most critical aspect of cooling is proper adjustment of the divider plate (there are many threads on this forum that discuss how to do it.) Fail to do it properly, and your engine will run too hot regardless of which pump you use.