print matched column from multiple inputs and concatenate the output - awk

Question

print matched column from multiple inputs and concatenate the output
A.lst
1091 1991 43.5 -30.1 -11.4
1091 1993 -11.2 -28.5 -2.7
1091 1997 35.8 -13.2 -4.5
1091 2003 -26.8 -23.9 0.6
1091 2007 23.8 64.8 3.5
1091 2008 -45.8 70.7 -6.0
1100 1967 24.5 -25.6 -12.7
1100 1971 -935.0 9.3 52.0
1100 1972 -388.8 59.1 20.4
1100 1974 17.7 48.9 3.0
B.lst
1091 1991 295 1
1091 1993 293 3
1091 1997 296 7
1091 2003 287 13
1091 2007 283 17
1091 2008 282 18
1100 1967 1419 3
1100 1971 56 7
1031 2023 283 17
1021 2238 282 18
1140 1327 1419 3
1150 3971 56 7
1100 1972 55 8
1100 1974 1445 10
By using this command (from previous, cant remember from where, i'll credit to them once i found it),
NR==FNR{
a[$1,$2]=$1; next
}
{
s=SUBSEP
k=$3 s $4
}k in a{ print $0 }
But I've no idea how to combine the output
it should print only matched (certain column $3 $4 from B.lst)
1091 1991 43.5 -30.1 -11.4 295 1
1091 1993 -11.2 -28.5 -2.7 293 3
1091 1997 35.8 -13.2 -4.5 296 7
1091 2003 -26.8 -23.9 0.6 287 13
1091 2007 23.8 64.8 3.5 283 17
1091 2008 -45.8 70.7 -6.0 282 18
1100 1967 24.5 -25.6 -12.7 1419 3
1100 1971 -935.0 9.3 52.0 56 7
1100 1972 -388.8 59.1 20.4 55 8
1100 1974 17.7 48.9 3.0 1445 10

Answer 1

Could you please try following.
awk 'FNR==NR{array[$1,$2]=$3 OFS $4;next} (($1,$2) in array){print $0,array[$1,$2]}' file_B file_A
Adding a non-one liner form of above solution now.
awk '
FNR==NR{
array[$1,$2]=$3 OFS $4
next
}
(($1,$2) in array){
print $0,array[$1,$2]
}
' file_B file_A
Explanation: Adding explanation for above code.
awk ' ##Starting awk program here.
FNR==NR{ ##Checking condition FNR==NR which will be TRUE when file_B is being read.
array[$1,$2]=$3 OFS $4 ##Creating an array named array whose index is $1,$2 and value is $3 OFS $4.
next ##Using next will skip all further statements from here.
} ##Closing FNR==NR condition BLOCK here.
(($1,$2) in array){ ##Checking condition if $1,$2 is present in array then do following.
print $0,array[$1,$2] ##Printing current line and then value of array with index of $1,$2
}
' file_B file_A ##Mentioning Input_file names here.