Both are the same level colleges. As per the analyzing report of Careers360 GLA Mathura has AAA rating & GL Bajaj has AAA+ rating which means above average. The rating is based on the research of the colleges on placement, Faculty, Study Environment etc. You can also check the genuine reviews of the colleges with the given below links.

https://engineering.careers360.com/colleges/g-l-bajaj-institute-of-technology-and-management-greater-noida

https://engineering.careers360.com/colleges/gla-university-mathura

Good Luck!