file1.txt:
234  13  4  49 +  TAT_01  id_nu1  explan1
236  123  3  67 +  TAT_02  id_nu2  explan2
534  12  8  13 +  TAT_03  id_nu3  explan3
764  124  9  33 +  TAT_04  id_nu4  explan4
224  153  2  37 +  TAT_05  id_nu5  explan5

file2.txt:
334  138  34  39 -  TAT_02  PAS_1 id_nu2  new2
545  154  83  11 +  TAT_03  PAS_2 id_nu3  new3
765  131  21  12 -  TAT_05  PAS_3 id_nu5  new5

desired_results:
234  13  4  49 +  TAT_01  id_nu1  explan1
334  138  34  39 -  TAT_02  PAS_1 id_nu2  new2
545  154  83  11 +  TAT_03  PAS_2 id_nu3  new3
764  124  9  33 +  TAT_04  id_nu4  explan4
765  131  21  12 -  TAT_05  PAS_3 id_nu5  new5