Different fee rate units - sat/vB, sat perkw, sat perkb
No, one vbyte [vB] is equal to four weightunits [wu]. The people working on C-Lightning use &quot;sipa&quot; interchangeably for a weightunit.
1,000 sat/kvB = 1 sat/vB
1 sat/vB = 0.25 sat/wu
0.25 sat/wu = 250 sat/kwu
20 sat/vB = 5,000 sat/kwu
Also see: Is there a difference between bytes and virtual bytes (vbytes)?