The former dish is a very economical staple whereas the latter is considered a luxury by the locals, hence the name 'weeki', ie at the most they can afford this 'extravagance' once a week.
You can get these in many restaurants, but go for one that looks more traditional, where they tend to stick closer to the normal recipe. Prices however are not economical by local standards!! You're a tourist after all, trying out a 'novelty item' (2 in this case!!)
