Same H7 bulbs in all four.
You appear to have the SE model that often has 55 watt H7 Halogen bulbs in all four headlights. The two outer top squarish reflectors are for the dipped or low beams and the two inner round lower reflectors are for the main or high beams.
If in place of the squarish reflectors, you have the round glass projector headlights with the HID D2S xenon bulbs, they give off light at about 4100K, which appears as a nice white colour with very little blue or yellow apparent. ...and yes, regardless of what the upper outside beams use, the lower round inside high beams use 55 watt H7 single filament bulbs.
It appears that PIAA is advertising what they call Xtreme White Plus H7 bulbs that give off a "whiter" light rather than a bluish or yellow light. If so, this is good as the less blue in the beam, the better ones eyes can discern what is being illuminated. Given a choice between blue and yellow, I tend to prefer bulbs tending to the yellow colour however the 4100K colour of the HID's is of course the ideal.
If you have the squarish reflectors on top, one might want to change all 4 bulbs at the same time for colour matching purposes, however given the high beam is not used much, at least in urban areas, the colour matching will not be seen much.
My understanding is that the more blue colour bulbs often seen on Beamers makes the chick magnet function better. I gather however that being able to see the road is a greater concern with Land Rover drivers; also the chick magnet works well and does not require any augmentation.
http://www.tirerack.com/lighting/detail.jsp?ID=1081&cat=Headlight+Bulbs