Open either one of them. Copy the password. Look in Recently Use Apps for the Amtrack app. tap it. Long-press in the password space. When you let go, there should be a Paste button. Tap it.
If that doesn't work,
Keepass2Android should work. (About the only problem I've found is apps that clear the input as soon as they're not the foreground app [one of the all-time not-great-ideas], so you can't do both the username and the password that way, and that's the app itself, not the password app - and there's nothing you can do about that but paste the password, then type the username - assuming that the password is more complex than the username, which it should be.)