So far my guess is: 62.6 cc new saws 363.0 and 400.1 would be "the same" except of the carb adjustment (perhaps also coil, piston, ...?). Cc-wise it will fit just between 261 and 462. So basically one model will replace 59.0 cc 362 and 66.8 cc 400. And last but not least, both well established...