TV Shows Extras matching within season

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I am playing around with TV Shows Extras within seasons for the first time. I normally name the episode file as follows:

Planet Earth II - S01E01 - Islands (2016) - 2160p.mkv

However, when trying to get the behind the scenes extra to match, I found I had to drop the 2160p from the file name. In other words, to match the two files are called as follows:

Planet Earth II - S01E01 - Islands (2016).mkv
Planet Earth II - S01E01 - Islands (2016)-behindthescenes.mkv

The behind the scenes content is in 1080p, so it doesn’t make sense that I have the 2160 label for the behind the scenes content. If anything, I want it to have the 1080p label. My understanding though is that the Extras content has to end with “-behindthescenes”.

Is there any way to keep my normal file naming conventions and still have the items match? In other words I would like the following two to match:

Planet Earth II - S01E01 - Islands (2016) - 2160p.mkv
Planet Earth II - S01E01 - Islands (2016) - 1080p-behindthescenes.mkv

Not that I am aware of. There likely some odd edge cases where it might work with some specific naming differences but afaik the base file names have to be the exact same just like subtitles for example.

Thanks.