Same radar used in 2 variants of ids but only the german prem gets earch mode?

both the italian ids and the german premium ids wtd61 use the ari 23274 but while the italian ids only has access to the acm mode the wtd has a search mode and i know that doesn’t make or break the planes i just want to know why this inconsistancy in the radars or if theyre different models but it’s not shown in-game