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Hello from JustAnswer.
Yes, it would generally be OK to combine the 25 patches with the 75 patches until they are used up. This would be equivalent to using the 100 patches.
The only potential issue in this situation would be whether the older 25 patches are still good. If the patches are not yet beyond the expiration date and they have been stored properly, then they would still be OK to use. Poor storage conditions would be much more likely to have an adverse effect over longer storage periods. The patches should have been stored at room temperature and away from excessive heat and moisture.
So, if the 25 patches are in date and have been stored properly, it would be fine to combine them with the 75 patches until they are used up.
If I can provide any additional information, please let me know.