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I would, it should be pretty easy to do with a DMM. If it is anything like a Princeton Reverb, it will have a pot and test points, you just get he schematic and set the MA rating between 2 points.
Longevity might be affected if the bias is too hot, but I suppose if it sounds okay when you swap them it should be broadly in range.
I suppose it's like buying new tyres and not getting it balanced, the car won't crash but it may not drive its best and the tyers may wear out quicker.
Your amp should be fitted with Groove Tubes (which could well be JJs, they will be labelled GT-6V6-S).
If you purchase Groove Tubes with the same rating number then you will not need to rebias the amp.
Of course you will pay extra for this.....