Hi,
Per my experience, which boot image is picking up during the PXE process has very little impact in most cases because as soon as the TS engine starts a TS, it checks to make sure that the system is booted to the boot image corresponding to the TS. If this is not the case, the correct boot image is downloaded and the system reboots into this downloaded boot image.
In other words, we could not manually select which boot image is used during PXE process. Here is an awesome article about this for your reference: Boot image selection in ConfigMgr
Thanks for your time. Have a nice day!
Best regards,
Simon
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