Infers makes no sense there. Even were I to think you meant implies, then the sentence is ambiguous. The manifesto in 2015 supported austerity. If DM has been in charge then as already covered it seems likely that would have been even closer to the Tories. I would hope they might have stopped Universal Credit but not clear that would happen under DM.
It is in the nature of Blairism to have matched the Tories in the early years or months.
Miliband would have then been keen to promote a progressive vision of Britain.
The closeness to toryism you propose is I move coloured by your SNP leanings.
With Brexit not even on the table and I will qualify that later, The west Lothian question would loom large since that was unfinished business from the Cameron era.
Osborne we can presume would have been gone with Cameron.
The burgeoning English national sentiment would be divided between a Conservative push to 'unionism'...code for more uniform control by Westminster supported by the leader of the Opposition Boris Johnson and creaking government in Scotland, Wales and Northern and withdrawal from Europe promoted by an increasingly popular UKIP under Nigel Farage.
With the right so split Miliband would be free to knock the edges of austerity and run a Blajorist Government.