The time on the ip phone is a representation of the time.
In the maintenance command of the 3300, you can type readdatetime and it will show you the real time of your 3300. It should be the same as your NTP server. This time is use for the SMDR and real time reporting.
On the IP Phone, it's not a priority for him to synchronise his time with the 3300.
So you can have different time on two phone.