From citizensinformation.ie :
"Under Section 26 of the Maternity Protection Act 1994 you are entitled to return to work to the same job with the same contract of employment. Section 27 of the Act states that if it is not reasonably practicable for your employer to allow you to return to your job, then they must provide you with suitable alternative work. This new position should not be on terms substantially less favourable than those of your previous job.
Otherwise, you are entitled to be treated as if you had been at work during your maternity leave. Your employment conditions cannot be worsened by the fact that you have taken maternity leave, and if pay or other conditions have improved while you have been on maternity leave then you are entitled to these benefits when you return to work."
Would the terms of your employment be the same or similar? I.e. wages, hours, etc?