Difference between these two buck converters
Looking to power an 110V AC lamp containing an LED with my 12V car. The lamp assembly cannot be disassembled without destroying it

Since you cannot connect to the LED directly (bypassing the circuit which converts 110 V AC into whatever DC voltage and current the LED needs) the DCDC converters you propose are useless for this.

What you need is a module which converts 12 V DC into 110 V AC, these are often referred to as inverters. Here's an example



However, there can be issues with using such a cheap inverter. It works not at 50 or 60 Hz (like mains AC) but at a much higher frequency, like 50 kHz.

It depends on the design of your LED lamp if it can accept that. If it has a capacitive dropper circuit inside, there will be issues. Issues in the sense that your LED lamp can break.

There are also 50 / 60 Hz inverters available but these are much more expensive as these need a much larger transformer. Look for a box which can be used to provide 120 V or 240 V AC and is powered from a car's battery, here's an example:



But you're really much better off getting an LED lamp suitable for 12 V. There are plenty available if you just look for them.

But back to your actual question, the difference between the DCDC converters.

Both modules are quite similar in how they work. It depends on your needs which one is suitable, often both are equally suitable. But since we cannot access the LED, we do not know what we need. You made a table comparing their specifications. Look at the differences and those are the differences.