Hello, thank you very much Ulf for answer. For now I have that :

Whaler LORENZ BRUUN built by A/S Jarlsø Vaerft, Tønsberg, Norway
221 GRT, 83 NRT, pp. 111.2' x 23.1' x 13.2', 69 NHP, 1 triple expansion 3-cyl. by builder, 1 screw, 1 deck
1925 completed for ? = LORENTZ BRUUN
? owner Hvalfangerselskapet Polaris A/S (Melsom & Melsom), Larvik, Norway = POL V, (LCVJ)
1938 ? owner Bryde & Dahls Hvalfangerselskap A/S (A/S Thor Dahl), Sandefjord, Norway
1941 lent for South African Navy as auxiliary minesweeper
1942 name changed = BENONI
04.1946 returned ?

Whaler POL I built by Akers Mekaniske Vaerksted, Kristiania (Oslo), Norway
205 GRT, 67 NRT, pp. 111.8' x 22.0' x 12.8', 69 NHP, 1 triple expansion 3-cyl. by builder, 1 screw, 1 deck
1926 completed for Hvalfangerselskapet Polaris A/S (Melsom & Melsom), Larvik, Norway = POL I, (LCVF)
1938 ? owner Bryde & Dahls Hvalfangerselskap A/S (A/S Thor Dahl), Sandefjord, Norway
07.10.1941 lent for South African Navy as auxiliary minesweeper
03.1942 name changed = RANDFONTEIN
07.04.1946 returned ?

I will be greatful for any corrections/additions, and looks like those two disappeared in 1946. Best regards, Kris.