EM7565 - How to configure preferred RAT

IoT Modules
1

On previous modems (non-SW) I have used I have been able to configure the RATs and also select a ‘preferred’ RAT. e.g. 3G/4G with 3G preferred, or 3G/4G with 4G preferred.

I am attempting to do the same with an EM7565 using SLQSSetSysSelectionPrefExt().

Can anybody explain the difference in settings pAcqOrder and pRAT. e.g.

    SLQSSetSysSelectionPrefExt()...
        sysSelectPrefParamsExt...
           pSysSelectPrefParams...
               pAcqOrderPref.acqOrderLen = 2
               pAcqOrderPref.pAcqOrder = {0x05, 0x08}    //i.e. UMTS first, LTE second

and,

     SLQSSetSysSelectionPrefExt()...
        sysSelectPrefParamsExt...
           pSysSelectPrefParams.pRAT = 0x05    //i.e. UMTS preference

I have tried both methods, but the EM7565 always acquires LTE first?