You need to add the Comparison like for like as an additionally values in your market-field and then you could query these value, for example:
if(market = 'Comparison like for like', exp1, exp2)
Another approach is to switch to a pivot-chart and adding a further dimension which could be queried with:
if(dimensionality() = 0, exp1, exp2)
A further approach (which I prefer) would be to display only one view at a time - one time the year-comparing overall and one time the cleaned year-comparing. For this you could use two objects maybe within a container - also the use of dimension/expression-groups is a possibility.