Is the 5 bolt pattern on a 1990 12 ton Chevy truck same as in corvette?

No, a 1990 12-ton Chevy truck and a Corvette (regardless of year) will almost certainly have different bolt patterns. Heavy-duty trucks like that use much larger wheels and tires, requiring a significantly different bolt pattern to accommodate the increased load and size. Corvettes use a passenger car bolt pattern. They are not interchangeable.