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Yes, RyanAir says that baggage allowances can be pooled:
Yes, you can pool or share your purchased baggage allowance with other passengers included in the same flight reservation when checking-in together.
For example: If two friends travelling on the same booking purchase two 15kg checked bags, one of them can check-in a bag weighing 17kg and the other can check-in a bag weighing 13kg, as long as the total paid checked baggage allowance is not exceeded.
If they allow this even for multiple passengers on the same ticket, then clearly there would be no problem with pooling multiple bags for a single passenger.
Note that no single bag can weigh more than 32 kg (also from the above link).