It;s okay to substitute.

Family favorite: pea salad. peas, chopped celery, teeny cubes of cheese, mayo.
Hubby asked for some. I didn't have peas, so used green beans. Celery all gone, so used chopped cabbage. Not enough cheese, so boiled eggs. No mayo in sight, but had olive oil and salt and pepper.
Hubby, as usual, didn't complain. Probably couldn't even tell the difference.