Apart from subtle differences (4 vs. 6 SATA ports, 8 vs. 12 USB ports, etc.) the ASUS board should be fine. Your hardware will
be compatible with the new board.
I like ASUS motherboards; they're generally reliable and offer some nice features. Here are two links comparing their specs:
ASUS: Foxconn 2AB1 Mainboard Specs
Foxconn: ASUS - Motherboards- ASUS M4A88T-M
As for the error and what the cause may be, it's a crapshoot. The fact that you get your error message during intensive gaming can signal heat issues, video card problems, or even memory problems (these are the most common problems to look into).
Have you tried any tests (Prime95 (Free Software - GIMPS
), MemTest (Memtest86+ - Advanced Memory Diagnostic Tool
), etc.) on your rig? I'm not saying that the motherboard ISN'T the culprit, but the fact that your problems occur during graphic-intensive games can help us troubleshoot. It'd be worth looking into a few of these possibilities before pulling the trigger on a new upgrade.