s/^(IMB,\d+,V1\s+,)(\d+),\K
  (?:.*\n)+
  \1\d+,(\d+).*/$3/gmx;

s/^($type,\d+,$version,)(\d+),\K
  (?:.*\n)+
  \1\d+,(\d+).*/$3/gmx;