Pretty much. Also with the call option you have to pay the premium (and possibly the rollover cost if for some reason you wanted to match exactly the equivalent RSU schedule), on the other hand if the stock price goes down at worst you lose the premium, while the downside with RSU can be much larger.
In practice it would be foolish to invest a large part of your salary in call options of the company you work for. But for the same reason RSUs are also similarly risky and you should always prefer cash and diversify your risk instead.
Edit: If you buy an at the money call and sell the equivalent put you can reduce the premium and replicate the risk profile of the RSU. But I'm not an option trader.
In practice it would be foolish to invest a large part of your salary in call options of the company you work for. But for the same reason RSUs are also similarly risky and you should always prefer cash and diversify your risk instead.
Edit: If you buy an at the money call and sell the equivalent put you can reduce the premium and replicate the risk profile of the RSU. But I'm not an option trader.