Jmeter what is the difference between Gui and Non Gui?

Question

stress testing

Good day everyone.
Back to jmeter.
The situation is as follows.
I run the test in GUI mode, it shows me results that are more or less true. But, because conducting large tests is not recommended in the GUI, I started testing in Non GUI (because the GUI is allocating unnecessary resources and load).
Okay, I'm testing in non gui (jmeter -n -t *testplan.jmx*). After that, I go to the GUI and open the results of the execution. On some tests they are similar, but on others they are 3 or 4 times higher than the values.
The test plan is the same, everything is the same, the log writes correctly, does not duplicate anything, but the actual test values ​​have increased.
I decided to get to the bottom of the truth and understand why this can happen.
I thought that maybe properties were explicitly specified somewhere in the GUI, but no. There is no such thing. Studied various launch modes, also gave nothing.
Can you please tell me what is the main difference?

Answer 1

As far as I know there is no difference. But I would not copy, but make it simpler: run the gui as a controller, and the second instance as a generator. Then you can see what is happening in real time. And it's easier to analyze.