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Generally speaking on TV RF/IF tubes if they don't test bad the set works well, and it wasn't some idiots hack substitution for a non/borderline-compatible type leave it how it is. Different tubes can change a TV's alignment, and unless you have the equipment, experience and patience to do a complete TV alignment it is best not to f--- with it.
Many sets went through several production changes in their time on the lines in order to use the cheapest parts, or fix operational issues. Best move is to restore it the way it was, and not try to add production changes it never had.....Unless the change is in a circuit that is working poorly, and all other remedies have been tried.
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