They are both measures by which to value a player.
Both Levy and Kane are well aware of the market value of footballers around them. By offering him a contract on £200k a week, Levy was showing Kane that he valued him at around the same level as counterparts such as Martial, Maguire, Van Dijk and Chilwell, players who have gone for between £50 and £100m in recent windows. By accepting that offer, you could well say Kane was happy to agree with that valuation.
Now Levy is saying that £100m is not enough to buy Kane, and that he is a £150m or more player. Well that is fine, that's his prerogative - but Kane is certainly within his rights to question why that value is suddenly so much higher than the value Levy set when negotiating his wages.
When you start talking about £150m for players, the wages tend to reflect those valuations. Mbappe is on £400k a week, Lukaku has just signed something similar following his £100m+ transfer. God only knows what Neymar is on.
Levy is having his cake and eating it. He can do that because Kane and his brother were so monumentally stupid when negotiating that last deal, but their naivety doesn't change the fact that Levy is being a bit of a dick.