What makes you think that the engine seized? It is very rare for a Toyota engine to seize; unless it ran out of oil, or was allowed to grossly overheat. Even if it had overheated; a much more common consequence than seizing would be that the head gasket blew and allowed coolant to fill a cylinder. That would create a condition called hydrostatic lock; in which the piston would come up against the coolant in the cylinder, and since coolant is essentially non-compressible; the engine would not be able to turn further.
The test for this is to remove all the spark plugs and then try the starter. If the starter then spins the motor, and coolant sprays out of a spark plug opening; the head gasket is blown, and the head is probably cracked or warped. This can be repaired by removing the cylinder head and having it tested for cracks and warpage by a machine shop. The head will either have to be be remachined, or replaced. This should cost less than buying and installing another engine.
But in answer to your question; the 22RE 4 cylinder and the 3VZE V-6 engines used in the 93 4runner were only subsequently used in 1994 and 1995. The 3VZE V-6 turned out to be a bad design; and was superseded in 1996 by a vastly improved motor; but it was a totally different design, and probably would be very difficult to adapt to the 1993 vehicle. The SOHC 22RE 4 cylinder was a good motor; but was replaced by a more modern and powerful DOHC 2.7 liter 3RZFE in 1996. The 1995 Tacoma came out with the DOHC 4 cylinder motors a year before they were adopted in the 4 runner. The Tacoma had a choice of a 2.4 liter DOHC 2RZFE, or a 2.7 liter DOHC 3RZFE. These 4 cylinder Tacoma motors were used through 2004, and should also be adaptable to the 4runner; but read the next paragraph.
Swapping the later motors into a 93 4runner would require using the computer from the donor vehicle, and possibly changing engine compartment and passenger compartment wiring harnesses. It looks like the later motors will bolt up to the 93 transmission; but there were some years which used 6 different transmissions in the pickups; so it is impossible to know for sure.