Today I saw a Jeep Grand Cherokee SRT8 and the back tires were massive at 285-40-20

They are the same diameter 29" as the SRT8 Challenger.

The Challengers 255-45-20 are only 8.5" tread look small comared to the Jeeps 10".

Do you think the 285-40-20 will fit the rear of the Challenger as the first replacement set?