first file Format 
pos   start   end    id
chr1  11223   11224  rs2342349
chr2  23423   23424  rs6345435
chr3  64564   64565  rs3432456
chr4  56456   56457  rs7979979

second file Format 
id
rs2342349 #only match
rs3274234
rs2342344

Output1
chr1  11223   11224  rs2342349

Output2
Number_pos_1st_file    4
Number_pos_2nd_file    3
Nr_Matching            1
Nr_Non_matching        2