Is there any way to replace all components with the same part number to a different part number in the schematic?
If you just want to change the value of the part, you can do Tools → Edit Symbol Fields and edit it there. If you want to change the actual symbol, right click one of the parts and select Change Symbol. This lets you change everything with a given library identifier to something else.
Thanks, will this change all the occurrences of the part in the design or only that one?
You can do either - there’s options for both.