There are two Overhead openers in the garage of a house my friend just bought. The 1/2hp unit is an Eagle 1000. The 1/4hp unit is model 450-A. No remotes were left with house. I know these are the 9 dip switch units and they are pre-1995. The 450-A is 360MHZ, the Eagle 1000 is 380MHZ. I have found replacement remotes for both on the Overhead website.
I have 3 control boards removed from post 1995 Legacy model 496CD/B units. I also have spare remotes matching these boards. The PN(?) on the boards is 33000A-R3.
Question: Can I replace the boards in the old units with the later boards??