The experiment was successful. GHS Pressurewound L7200 (40-96) with GHS Progressive 130B (exposed core) on my Yamaha TRBX505 matched up really well.
That said, that same bass has been wearing the Rotosound Ultramag (Alloy 52 roundwound) 40-100 with the Progressive 130B for the last four and a half months and they're working out great! Meanwhile, I also tried the Ken Smith Compressors (Pressurewound equivalent) 40-58-80-102-125T on my Yamaha BB435 and liked them as well, although that bass is currently sporting GHS Super Steels 40-58-80-102-126 (non-tapered).