The easy answer is, YES! You absolutely can!
If you already have access to the NAR + Photofy business subscription, while signed into your Photofy app, go to http://photofy.com/remax-invite on your mobile browser to register for the RE/MAX + Photofy business subscription.
To keep everything under ONE log in account, make sure you're signed into the Photofy app..
Go to photofy.com/remax-invite from your mobile browser.
Enter your remax.net email address to validate your access if/when prompted, and complete any billing information necessary. Complete the registration process through to the "Success" message!
You'll be automatically signed in to your subscription. Now you should be able to toggle between the various accounts using the link at the bottom center of your main dashboard screen.