It should be okay, certainly better than the reverse.
But, I'd rather be safe than sorry. Take a look at both the Pentosin and Beck Arnley site. While not terribly user friendly, both sites list some compatibility guidelines for the product.
If it were me, my fear wouldn't be using it in the system, but mixing with what's in there already. For instance, the Pentosin stuff is supposed to be suitable for use in my G37. However, I'd only consider that with a complete flush and fill. I'm not so very desperate to find things to do that I want to do flush and fills with a $30 per litre fluid in a system that calls for Dexron-VI at a quarter that cost.
Of course, you're looking to use up product, and the mixing would rule it out for me.