Can I use a 65W charger with my i14 phone?

yes

Watt  is like how fast your car can drive, but the

speed limit is how fast your car do drive

the

iphone draw as much current as it was build to use when charging, the fact that

a charger can provide a lot more just means it's not having its full capacitive

used

A power source provides voltage; the appliance draws the current it needs. Assuming the supply voltage matches the appliance’s rating, the appliance receives the full source voltage but consumes only the current required by its design and operating conditions.

For example, a 230 V outlet stays at roughly 230 V whether it powers a 10 W LED bulb or a 2,000 W heater. The heater draws more current because it needs more power. A source capable of supplying more current does not force that current into the appliance—it simply makes it available.

The same principle applies to iPhone charging. Apple USB-C power adapters typically accept 100–240 V AC input, allowing them to work in many countries. Whether you use a 20 W, 30 W, 61 W, 90 W, or 140 W adapter, the iPhone draws only the power it is designed to use. A higher-wattage adapter has greater capacity; it does not push extra power into the phone. The iPhone and charger communicate to select an appropriate charging voltage and current for safe, efficient charging.

Too high an amperage and your iPhone is damaged.

Wrong, a phone will only draw a much current as needed.

Probably,

Plug in and find out.

To make sure, look on the bottom of the brick to see if it supports 9V 2A (18W) or something.

'

This is what the 30W brick does, but it also can do others. It's worth a try to take a look at the product specifications on the product webpage in the apple store too.

Maybe, maybe not. We need to know the volts and amps also. Too high an amperage and your iPhone is damaged. Too low in amperage and it won’t charge or charge too slowly. If the volts are too high you can melt your iPhone.

Read the label and post all the specifications.