According to the supplier, it is compatible with the mentioned DENON stage :)

Here is all the information we have on this product: Type: VM Stereo Dual Magnet, Mounting: 1/2" centres, Frequency Response: 20 - 22,000 Hz, Channel Separation: 20 dB (1 kHz), Output Channel Balance: 2.0 dB (1 kHz), Output Voltage: 4.0 mV (@ 1 kHz, 5 cm/sec), Vertical Track Angle: 23°, Vertical Bearing Force: 1.8 - 2.2g (standard 2.0 g), Diamond Type: Elliptical, Diamond Size: 0.3 x 0.7 mil, Diamond Attachment: Bonded Round Shank, Cantilever: Aluminium Pipe, Coil Impedance: 3.3 kΩ (1 kHz), Coil Inductance: 550 mH (1 kHz), DC Resistance: 485 Ω, Static Compliance: 17 x 10 - 6 cm / dyne, Dynamic Compliance: 7 x 10 - 6 cm / dyne (100 Hz), Cable used for Coil: T.P. Copper, Recommended Load Impedance: 47,000 Ω, Recommended Load Capacity: 100-200 pF.

You can replace them without any problem. But I don't think that a noticeable increase in quality is possible. Unless the quality of the ones now installed is so terribly bad.