You need to check what capacitance range you require, and see in the datasheet if it is possible with the control voltage range that you have
(and check the reverse voltage in the datasheet).
That is all you need to check for most of these simple FM circuits.
Often a varactor datasheet will state if it is intended for AM or for FM broadcast band circuits, so you instantly know if
the capacitance range is likely to be suitable (and you can then check the graph).
Your diode is a single one, but sometimes a dual diode is used, or your circuit may have two MV2109 devices.
Something like BB914 or MMBV609LT1G may be highly worth checking out, as suitable for such a role.