I did! It's gone in an SG as the T-Type neck pickup it came with is a woolly mess.
In short, very, very different to the PG Blues. It's called the Old Guard, but that's just marketing to indicate the output range; the OG neck feels to me like a much more modern pickup than the other A2 BKPs, whether it's the PG Blues, Stormy Monday, or 10th Anniversary. It's got a quicker attack and more solid-feeling bass than the vintage-leaning pickups - it's a great pickup, just different. Less airy/open in the very high frequencies, a smooth high end, and brilliantly clear, both on the pick attack and string-to-string. Warmer than the PG Blues, but the biggest difference really is the feel.
Was there any reason you wanted to compare to the PG Blues specifically - I'm guessing that's what you've got at the moment?