Are there BOM differences between boards operating in the different RF bands?

The impedance of the RF output and input pins of the ADF7030-1 must be matched to the impedance of the antenna in order to minimize losses in power between the antenna and the radio. An impedance matching network is built on the PCB to achieve the necessary transformation. Impedance matching networks are made up of capacitors and inductors which are frequency dependent. These components differ between bands. For example, 433MHz will have a different set of values compared to 868MHz. ADI have recommended values for each frequency band.
Harmonic filter requirements and some decoupling capacitor values can also differ between bands and regions.
See the Hardware Reference Manual for more info.