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4P1L Tubes

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I currently use 4P1L tubes in my Little-Dot II+, having replaced the stock Chinese 4P1S tubes.  As I understand it, the 4P1L tube was produced in the Soviet Union between the late 50's and early 80's.

 

Does anyone here have enough experience with this tube to know if there will likely be any difference between one of the earlier 4P1L tubes and one of the later ones?  My 4P1L tubes were made in 1981, which makes me wonder if it would be worth it to seek out an earlier pair.

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