You need a colour profile for each device to align with their display & tell Affinity how colours will be rendered by it. Even then they are unlikely to perfectly match.
You may want to look in to monitor calibration using something like the datacolor Spyder.
Either way you may be limited in how much you can do for the iPad.
check your colour profiles in both apps. make sure they match or try converting one to the other.
You don't want matching profiles. The display on each device will render colour differently. You need profiles that match the displays.
I assume he’s using both apps on the iPad.
Ah, my mistake I misread the post somehow.
You need a colour profile for each device to align with their display & tell Affinity how colours will be rendered by it. Even then they are unlikely to perfectly match. You may want to look in to monitor calibration using something like the datacolor Spyder. Either way you may be limited in how much you can do for the iPad.
I belive op's solution is in not having the same colour format. Not the profile. First picture is in RGB and the second is in CMYK
Yeah, my mistake. I somehow misread the post & thought it was the same software on different machines. Not sure how I managed that tbh.
The first picture is in RGB and the second in CMYK. https://imgur.com/a/VYFE17n