A B737-800 WAS DISPATCHED WITH BOTH B737-700 NOSE TIRE AND WHEEL ASSEMBLIES INSTALLED.

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ON JUN/THU/06; AT XA00 HRS I WAS ASSIGNED TO ACR X WHICH WAS IN ATLANTA; GA; FOR SCHEDULED MAINT. THERE WERE 2 MAINT CARRYOVERS ON THE NOSE TIRES THAT WERE SHOWING CORD. WHEEL ASSEMBLIES WERE TO BE REPLACED. I WENT INTO THE BREEZEWAY DIRECTLY IN FRONT AND FOUND 2 737N TIRES LOCATED AGAINST BREEZEWAY WALL. WALL LABELED 737N. I LOOKED AT THE PARTS TAG MANUFACTURER PART NUMBER IDENTED TIRE AS B737N. I ROLLED BOTH TIRES TO FRONT OF ACFT. I PROCEEDED TO JACK ACFT AND REMOVED BOTH TIRES AT ONCE; THEN INSTALLED BOTH TIRES AT SAME TIME. NEVER HAVING THE TIRES CLOSE ENOUGH TO EACH OTHER TO EVER NOTICE A DIFFERENCE; AND SINCE PART NUMBER LABELED B737N WAS ON SERVICEABLE PARTS TAG. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED HE NOTED THE PARTS TAG IDENTED THE TIRE AND WHEEL ASSEMBLIES AS 737N. THIS IDENTED THE ASSEMBLIES AS B737 NOSE TIRES AND WHEEL ASSEMBLIES BUT NOT MODEL NUMBER. THE RPTR DID NOT TAKE THE TIME TO ENSURE THE WHEEL AND TIRE ASSEMBLIES WERE FOR A B737-800.