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I think the only real difference among all the 23V/25 delta gun types are cosmetic or enhanced performance items, such as etched glass faceplate vs. clear, or black matrix vs. not. I haven't had any trouble substituting one for another. The 23V types (23VALP22, etc) are later models and should offer better performance all the way around than the 25AP22, 25XP22, etc. The 23V types may also be certified to emit less than a certain amount of X-radiation but I am not certain of this.
The only problem I can see in subsituting delta gun tubes comes with some 25V types...I know the later 70's RCA XL-100 chassis used 31 kv on the CRT anode and some earlier 25V types are not rated for this higher voltage.
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