Mixing XTOL and MYTOL

I mixed up a batch of LegacyPro XTOL a week ago and developed a couple of rolls of film. I thought I had another package to mix and use as a replenisher. Turns out I don't have another package. I do have the chemicals to make MYTOL. Do you think I can use MYTOL as a replenisher to XTOL?

Yes, in principle, but whether the results will be perfectly on spec is uncertain. You'll get developed film alright, there won't be any explosions, and 'in a pinch' it'll work. But to prevent further possible drift in the future, I'd replenish with real XTOL once you get it, or perhaps even replace a significant part of the working stock with new XTOL (and then season it).

Frankly, if you run a replenished system, I'd just set that apart for now and run the rolls you've got now through plain Mytol and then go back to your replenished system once you've got the official product again.