Replace date if x value with other column date else keep date

I have a column (Lovet leveringsdato) where if no date has been input the default date is 01.01.1753. 

I want to replace all values containing 01.01.1753 with date from column (Levert dato), if other date then keep the date. 

I have tried with these formulas:

= Table.ReplaceValue(#"Egendefinert lagt til",each [Lovet leveringsdato], each if Date.From([Lovet Leveringsdato]) = #date(1753, 1, 1) then [Levert Dato] else [Lovet leveringsdato],Replacer.ReplaceValue,{"Lovet leveringsdato"})

and

= Table.ReplaceValue(#"Egendefinert lagt til",each Date.From([Lovet leveringsdato]), each if Date.From([Lovet Leveringsdato]) = #date(1753, 1, 1) then [Levert Dato] else [Lovet leveringsdato],Replacer.ReplaceValue,{"Lovet leveringsdato"})

Here are the columns