Remove duplicates from two files using n characters for comparison

Shell Programming and Scripting
1

Hi All, I have two files
file1

123456CRTGHG
125437CRNDGF
126537CRDDGF

file2

123456CRTZHC
124567CJHGHG
125987CJHGDF

I need to compare the two files and any records in file 1 and 2 based on initial n characters (6 in example) need to be ignored.
string separated by unprintable character

result

124567CJHGHG
125987CJHGDF

Many examples of using fields none for characters help please thanks

2 
 
awk 'NR==FNR{X[substr($0,1,6)]++;next}{if(!X[substr($0,1,6)]++){print }}' file1 file2
3

Thank you pamu, that resolved the issue, thanks