That's correct. The problem is that only a single game came on a TR1ROM board: the licensed version of Gauntlet from Tengen, and even that came in DRROM and TR1ROM variants. The DRROM variant is not usable for Rocman X because of ROM size restrictions; only the TR1ROM variant can be used. Rad Racer II is another game that uses 4-screen mirroring, but its TVROM board cannot be used for Rocman X either, again because of ROM size restrictions.
Therefore, Rocman X (and Jurassic Boy 2, which is similar) maybe among the most difficult games to put on a donor board.