No, they won't fight but you shouldn't keep them together anyway, in my opinion.
This is because:
- They could breed too early, causing lots of problems for the female, even leading to her death.
- Without quarantine, she could infect your male snake or transfer mites etc.
- If one regurges its meal (which can be serious), or has a 'nasty' poo, then you don't know which one.
- Snakes are solitary creatures and are stressed by company.
There's lots of other reasons why you shouldn't cohabitate snakes. If you can't afford another tank and all of the things to go in it, then you shouldn't get the female.
All the best
David