Toulouse went down 54-28 to York City Knights, while Limoux were defeated 38-22 by Gateshead.
Lokomotiv Moscow were easily beaten 60-20 by Swinton.
The draw, which will see the Super League sides enter the competition, will be made at 1930 GMT on BBC Radio Five Live.
Castleford, who were relegated from the Super League last season, were comfortable 88-10 winners over neighbours Castleford Lock Lane while Widnes easily overcame Normanton Knights 78-8.
A late try from Kevin Crouthers, converted by Francis Maloney, helped Dewsbury Rams claim a dramatic 36-34 win over Leigh Centurions.
The Rams trailed 34-24 with just seven minutes remaining but Josh Weedon crossed to bring them back into contention before the late drama.
Leigh's Adam Hughes then missed a late penalty which would have taken the game to extra time.
In another all-National League 1 tie, Whitehaven saw off Doncaster 24-10 with two tries from ex-Castleford man Richard Fletcher while Carl Sice also touched down on his 100th appearance for the club.
Challenge Cup third round results
Batley 60-6 Widnes St Maries
Blackpool 18-42 Pia
Castleford 88-10 Castleford Lock Lane
Celtic Crusaders 50-10 Eastmoor
Dewsbury 36-34 Leigh
East Hull 10-26 Oldham
Featherstone 52-10 Drighlington
Gateshead 38-22 Limoux
Halifax 86-12 Eccles & Salford
Hunslet 40-22 Rochdale Mayfield
Keighley 34-6 Thornhill
Leigh MR 18-46 Sheffield
Normanton Knights 8-78 Widnes
Rochdale 48-6 Saddleworth Rangers
Swinton 60-20 Lokomotiv Moscow
West Bowling 8-24 London Skolars
West Hull 18-70 Barrow
Whitehaven 24-10 Doncaster
Workington 18-10 Oulton
York 54-28 Toulouse
Interview: Whitehaven coach Dave Rotheram