Low Pressure Tap on High Pressure System

[XJ75]

Ordered a load of stuff for a new cloakroom. We had a gravity fed system so I ordered a low pressure tap.

Since then we decided to have an unvented cylinder fitted to give us a high pressure system.

Obviously I know I can't use a high pressure tap on a low pressure system, but can I use a low pressure tap on a high pressure system?

I've missed the cut-off to return the tap unfortunately.

Thanks.