no, they're not
Corpus Christi (or Corpus Domini) is a liturgical celebration only scheduled in Italy, the Catholic Swiss Cantons, Brazil, Spain, Croatia, Poland, Germany, Ireland, Austria and San Marino
it's related with Christ's Last Dinner and rememeber the presence of Christ in the Eucharist...
it's scheduled for the first Thursday after the Pentecost (or, in the Countries where it's just a religious celebration but not a civil Holiday -like here in Italy, it's set on the second Sunday after the Pentecost)...
meanwhile Pentecost is the Holy Spirit descent on the Faithfuls and it's celebrated 50 days after Easter...
for most Catholic Countries, Italy included (except for South Tyrol, where they follow the German Countries and still have the Holiday Monday), the Holiday has only a religious matter and it's celebrated only on the given Sunday, meanwhile the Monday's rest has been abolished more than 100 years ago by Pope Pius X...
the only Nations having this privilege (Monday's rest, I mean) are Germany, Austria, Switzerland, the Netherlands, Spain, France, Belgium, Luxembourg (and the Italian region of South Tyrol, as written before)...