FCFE DR formula is derived from basic formula only:
FCFE = NI-WCinv -FCInv +Depreciation + Net Borrowing
FCInv +Depreciation = Net FCInv
FCFE = NI-WCinv -(Net FCInv) + Net Borrowing -Equation 1
Now think, You borrowed funds to finanace your FCInv and WCIncv. So
Net Borrowing = FCInV (Net Borrowing) + WCINV (Net Borrowing) -Equation 2
WCinv = D/A*WCinv (Financed from Debt) + E/A*WCinv (Financed from Equity) -Equation 3
Net FCInv= D/A*Net FCInv(Financed from Debt) + E/A*Net FCInv(Financed from Equity) -Equation 4
Add Equation 1,Equation 2,Equation 3 and Equation 4
You will get
FCFE = NI- E/A*WCinv - E/A*Net FCInv
FCFE = NI- (I-D/A)*WCinv -(I-D/A)*Net FCInv
So back to your original question:
You should use DR formula when you are given Individual growth rate of WCINV, FCINV and DR ratio itself.