Yes, I confirm that both Deepl configs have unique API keys and names.
I can no longer reproduce the bug, as the configurations now appear to be working independently. The issue only happened initially when I was switching exclusively between the two Deepl configs. However, after I switched to a Custom API config just once, it seems the problem resolved itself, and the presets are now "good" because they are functioning separately. Since the API key is no longer visible and only dots are shown, I'll only be able to verify which key is which in the future, when I check the character usage on my Deepl account.
Update: Right as I was about to finish writing this, I checked my two Deepl accounts real quick to see if the character counts had updated, and they did! So, fortunately, it looks like the issue has been resolved, as characters were charged separately to each account.

