Can i max out my 401k and 457 from same employer or is the limit a combination of both plans ?

The 401(k) and 457(b) contribution limits are separate, not combined.

https://www.irs.gov/retirement-plans/how-much-salary-can-you-defer-if-youre-eligible-for-more-than-one-retirement-plan

Thank you for prompt reply and link to irs site regarding this question