I need to make my Sugar Gliders BML tonight but I just realized that I dont have chicken baby food for it. Would it be okay if I just mashed up some chicken?

NO!
It'd be better to just wait till you have the bb food. The ratio is HUGELY different - not even in the same ball park.

I'd just feed the chicken you have along with some fruits and veggies and yogurt and "make due" till you can get what you need tomorrow :-)

OKay. Thanks!