I don't agree with that at all.
The daily grind would have been quite different, because agriculture changed quite a lot - people were growing different things, with different success rates. And the climate changed, which meant that housing (and what houses felt like) changed. Food changed, because people were growing different crops. The subsistence grains change quite a bit over that 300 years.
I'm not sure what you mean by 'religion and superstition' - that sounds quite pejorative? - but actually, religion also changes a lot in this period. The cults of the Virgin and St Anne are on the rise, and there's a shift towards affective devotion, both of which change the material experience of religious practice, and the imaginative horizons of practitioners. Broadly, I would say by 1400 it has become much more possible for a lay peasant to participate in church ritual (whether this is a good thing or not is moot; the point is that there is that shift, so there is a difference).
Medicine also changes over this period; though honestly, here I'm not sure how much it would affect peasants, and I'm not sure anyone else would know much.
Sanitation, transport and currency of course all change. One of the big shifts is towards urban populations, which actually have worse sanitation than rural, so I suspect the average health of a very poor person in 1400 may have been worse than in 1100; certainly there's a lot of urban pollution.
I think when you mention 'feudal relations' you may be thinking of mainland Europe. England never had true 'feudalism,' and after the Black Death it certainly seems that relations between landlords and their tenants did shift.