What is the difference between a doctor that has a family practice and a general practice at a multispecialty clinic?

Family practice. The main difference is that a family practice dr finished a 3 year residency in family medicine specialty. General practice dr is an older term they didn't do a residency but went right into field practicing they generally did everything including OB and surgery. Now the two are close in their scope of practice.
GP v FP. Only nomenclature. Several years back, someone decided that fam. Practice was a more friendly term and it found political correctness.