No, both are not the same. Bilofast m has Bilastine (20mg) + Montelukast (10mg) whereas Montek Lc has Montelukast (10mg) + Levocetrizine (5mg).
Both the combinations are anti-histaminics, that is anti-allergic medication, in simple terms, to control the allergic reactions/ symptoms.
You can take the medication for upto 6-8weeks in case of acute exacerbation and then taper it down to as and when you have allergic symptoms
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These drugs are known to cause drowsiness and hence preferably given at night