That doesn’t mean the purpose of them said tests are different. I’d imagine all TOCs have a slight twist on the information you read and have to remember whilst answering questions. The Standard of the psychometrics is set by OPC, how you get there may differ.
TOCs like TPE, Northern and LNER for example all adapt there pass mark to an ‘Enhanced’ standard but will also tell you if you’ve passed to a National Standard if failing the ‘Enhanced’
I didn’t do Glop in mine. I won’t go into what I did but it wasn’t Glop.