Freq is below 3 GHz, so I assume it is above 2 GHz.
In general if RF base frequency is above 2 GHz is 0603 a bit unusual big in size in my opinion if it is for consumer electronic.
Resulting signal function can vary a lot, not directly due to pad size but due to selected component size which affects pad size.
When building a copy of an RF radio application example: By manufacturer provided PCB design and BOM can not be adjusted and still expect same result.
For small capacitors, say 1-2 pF (as well as inductors) can stray capacitance be big part of component impedance at 2.4GHz and higher. Stray capacitance is much related to total body surface area.
In most cases are stray losses not critical for function but degrades filter functions and can cause a tuned circuit to become untuned.
A inductor, say 10nH at 2 GHz, can differ a lot in behavior depending on if selected size is 0603 or 0402. Especially if it is a design that require low losses and high Q as SFR can be as low as 5-6GHz.
A common problem is harmonics around 5 GHz and upward. Amount of not suppressed harmonics can differ a lot depending on which type and size of components that are selected even if stated reactive value is same.
As an example, S-curve for a 10nH 0603 wire wound coil of Murata or Coilcraft brand at 5GHz differs as night and day and because of this can doing the right selection of brand be critical if function is to suppress BT harmonics in range 4.8-5 GHz, FCC fail or not fail.
A value of 10nH is maybe a extremely high value at 5 GHz but sometimes does it come in play unusual ways such as a part of base band filtering and Tx biasing at 2.4GHz and will then also affect higher frequencies.
Most professional filter simulation software allows to switch between different component types such as film relative wire wound type of inductors, sizes and different brands to cover these non ideal differences.
Capacitors are more friendly and similar between different brands at these frequencies. Stray losses and ground losses due to less stable RF ground are among the more common problems related to capacitors in RF circuits that I have seen.
In my designs, BOM is a law. If customers selects another brand of components or other sizes of same component family is that not any longer a design that I am responsible for.
Whenever you design or select component values, at least for most common SMD inductors and capacitors, is it very easy to check S-parameters. All manufactures have them for download.
These results are often measured under very good circumstances so that PCB losses or stray losses affect result minimal so when checking SFR (self resonance frequency) add margins for your design.
SFR is the frequency where an inductor not any longer is an inductor, it becomes an capacitor.