What I expect to get: FMT/DP>40 from VCFs of two samples, and check sample identity, gives percentages or something.

What I have tried:

bcftools query -i'FMT/DP>40' -f '%CHROM\t%POS\t%REF\t%ALT\t%FORMAT\n' sample1.vcf.gz > sample1.txt
bcftools query -i'FMT/DP>40' -f '%CHROM\t%POS\t%REF\t%ALT\t%FORMAT\n' sample2.vcf.gz > sample2.txt

Then I used gtcheck to check sample identity

bcftools gtcheck -g sample1.txt sample2.txt

My question is:

It seems gtcheck can't compare two TXT files. I also tried output samples in the first chunk to vcf.gz but it still doesn't work.

Any help is appreciated.