Discerning FL2K devices with LDOs versus switching regulators

Greetings, In Steve Markgraf's slide presentation (http://people.osmocom.org/steve-m/fl2k_slides/osmo-fl2k.html), do slides 16 and 17 imply that some FL2K devices have LDO regulators while other using switching regulators?  Obviously, the FL2K devices that have LDO regulators are preferred, due to fewer spurious RF emissions.  How can one determine which FL2K devices have LDOs?  Can an FL2K device be reworked to use LDO regulators? Thanks, Mac