Ideally you must ensure that,
$$S R F=\frac{1}{2 \pi \sqrt{L C}}$$
The Self Resonant Frequency of the two separated circuits is the same.
Meaning they must have the same inductance L and Capacitance C product (i.e. not necessarily the same discrete L and C values).
Ohmic resistance does not affect the common resonant frequency however it affects the Q factor of the resonance (i.e. how sharp in bandwidth the circuit resonates):
$$Q=R \sqrt{\frac{C}{L}}=\frac{R}{\omega_{0} L}=\omega_{0} R C$$
Here the ohmic resistance of the circuit does matter as shown in the function above. The higher the resistance R the higher the Q factor and thus the resonance is more sharp that translates to less energy loss between the two circuits.
Make sure your coils have a ferrite core. That will greatly increase their inductance L and reduce their size.
Next optimize the mutual inductance M and coupling coefficient K of the two separated coils:
$$M=k \sqrt{L_{1} L_{2}}$$
In this case of wireless transmission - reception the higher k value closer to 1 is the better. Spatial alignment and proximity of the two coils will affect k.
Impedance Z matching, WP, between the two circuits meaning besides inductive and capacitive reactance $X_{L}$ and $X_{C}$, load ohmic resistance in both circuits R should be the same is many times no practically achievable because the different load requirements in the receiving circuit.
In that case use an impedance matching circuit on the receiving end to connect your receiving load (i.e. that would be the combined input resistance of the demodulator circuit and signal amplifier connected).