I don’t think so. It is highly possible that your degrees got changed. If you buy glasses with the expired prescription, you might not be able to get a clear vision as you expect.
Do you have s strong prescription? Or is your vision stable? I think it won’t matter too much if you have a very low prescription and your power has not changed a lot in the past.
Of course not. Prescription is the first priority for buying glasses. The reason to buy them is to get a clear vision. If you use the expired data, how can you guarantee that you can see fine with the new glasses? So you’d better recheck your eyes first.