Can I change the guide bar on my Stihl hs45 from 450 blade to 600?

This can be done. The parts required would be as below. 4228 710 6051 - Blade 600 mm / 24" https://www.lsengineers.co.uk/catalog/product/view/id/24844 4228 641 4610 - Guide 600 mm / 24" https://www.lsengineers.co.uk/catalog/product/view/id/24836 4228 790 9201 - Blade guard 600 mm / 24" https://www.lsengineers.co.uk/catalog/product/view/id/24847