When seeding a RPNG with a slightly different seed, will be random numbers generated generally be offset or widely different?

I understand that this likely has to do with implementation. But in general, when seeding a RPNG with two slightly different seeds, will the random numbers generated generally be offset or widely different?

I am interested in the C library random() in particular.

I wonder if the random numbers that will be generated with the seeds srandom(1345) and srandom(1346) will be as widely different as the random numbers generated with the seeds srandom(456) and srandom(234234132).