No you definitely have to trim it, the difference is huge.
How to improve performance of whip antenna of DVB-T
The can below it also helps greatly.
If you are afraid of cutting the whip, unscrew it and use a makeshift whip from copper or even steel wire.
Even though all shops say those whip antennas are for 1090 MHz, they actually for a whole other frequency: 800 MHz or so DVB-T.
They all want you to buy their more expensive antennas, so the cheap ones are bad on purpose. (or they can’t get cheap ones which are actually somewhat optimised for ADS-B)