Applicability of CLRA and BOCW Acts
If the contractor company employs or employed on any day of the preceding twelve months 20 or more workmen, then the CLRA would be applicable to said company. In Maharashtra, the words "20 or more workmen" have been substituted by "50 or more workmen" (notification dated 05th Jan 2017).
Similarly, if the work comes under the purview of the BOCW Act, then the BOCW Act is applicable. In your description, it is clear that the CLRA Act is not applicable to the said company as the employee strength is less than 50 or even 20. However, you are bound to comply under BOCW in respect of your on-roll employees. This is so because the subcontractor is already complying for their employees.
PF-ESI Applicability
The PF-ESI has nothing to do with the contract or subcontract. If the foreign company's employees' overall strength comes under the purview of the Acts, then PF-ESI will also be applicable.
For more clarification, please put a specific query so that learned members can throw further light on the matter.