Sql: are following two queries different (Left out join 'on' vs. 'where')?

Declare BigTable table (KeyColumn1 int, KeyColumn2 int, 
			KeyColumn3 int, KeyColumn4 money, column5 nvarchar (25))
Declare @Temptable  table (KeyColumn1 int, KeyColumn2 int, 
			KeyColumn3 int, KeyColumn4 money, column5 nvarchar (25))
@Temptable  has several thousand rows
Bigtable has million rows
Do the following two queries have any differnet?
Delete dbo.BigTable with (Rowlock)
  From dbo.BigTable  i 
  Left Outer Join @Temptable ii on 
  i.KeyColumn1= ii.KeyColumn1and i.KeyColumn2= ii.KeyColumn2
  and i.KeyColumn3= ii.KeyColumn3 and i.KeyColumn4 = ii.KeyColumn4 
  Where i.KeyColumn1= @IntNumber and i.KeyColumn3= @IntPeriod 
  and ii.KeyColumn1is Null and ii.KeyColumn2 is Null and ii.SubPeriod is Null and ii.PriceSoldAt is Null

vs.

Delete dbo.BigTable with (Rowlock)
   From dbo.BigTable  i 
   Left Outer Join @Temptable ii on i.KeyColumn1= @IntNumber and i.KeyColumn4 = @IntPeriod
	and i.KeyColumn1 = ii.KeyColumn1 and i.KeyColumn2 = ii.KeyColumn2
	and i.KeyColumn3 = ii.KeyColumn3 and i.KeyColumn4 = ii.KeyColumn4 
  Where ii.KeyColumn1is Null and ii.KeyColumn2 is Null and ii.KeyColumn3 is Null and ii.KeyColumn4 is Null
	

JaneC