I know this is way late ( only a year lol) but maybe it will help others. Here is what I had to do.
Just like you Zcloudman I copied the House texture config. to KLM texture config. them I went to aircraft config and copied the flightsim 0, basicly like what Axelsubo did in the video. Only I copied and pasted a new aircraft from the original. So the new plane looks like this:
[fltsim.1]
title=Embraer 190 KLM
sim=190
model=
panel=
sound=
texture=klm
kb_checklists=
description=
ui_manufacturer=Embraer
ui_typerole="Regional Jet"
ui_createdby=FeelThere
ui_type=Embraer 190
ui_variation=Embraer 190 Rollout
atc_heavy=0
atc_id=KLM
atc_airline=Embraer
atc_flight_number=PH-EZT
It seems to work for me and I showing both aircraft.
Hope it works for you.
Brooks Ingersoll