diff --git a/NEWS.md b/NEWS.md
index f1787cd20..a2a68e80f 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,5 +1,9 @@
 # teal.slice 0.7.1.9003
 
+### Enhancements
+
+* Relaxed assertions on  `teal_slices` to ignore duplicated `teal_slice` elements.
+
 # teal.slice 0.7.1
 
 ### Miscellaneous
diff --git a/R/teal_slices.R b/R/teal_slices.R
index 9b1bebfc8..f527c4a76 100644
--- a/R/teal_slices.R
+++ b/R/teal_slices.R
@@ -94,10 +94,12 @@ teal_slices <- function(...,
                         allow_add = TRUE) {
   slices <- list(...)
   checkmate::assert_list(slices, types = "teal_slice", any.missing = FALSE)
+  hashes <- vapply(slices, function(x) rlang::hash(isolate(as.list(x))), character(1))
+  slices <- slices[!duplicated(hashes)]
   slices_id <- isolate(vapply(slices, `[[`, character(1L), "id"))
   if (any(duplicated(slices_id))) {
     stop(
-      "Some teal_slice objects have the same id:\n",
+      "Conflicting `teal_slice` objects id. Items have the same id but their settings differ:\n",
       toString(unique(slices_id[duplicated(slices_id)]))
     )
   }
@@ -199,11 +201,11 @@ c.teal_slices <- function(...) {
   all_attributes <- lapply(x, attributes)
   all_attributes <- coalesce_r(all_attributes)
   all_attributes <- all_attributes[names(all_attributes) != "class"]
-
+  slices <- unlist(x, recursive = FALSE)
   do.call(
     teal_slices,
     c(
-      unique(unlist(x, recursive = FALSE)),
+      slices,
       all_attributes
     )
   )
diff --git a/tests/testthat/test-teal_slices.R b/tests/testthat/test-teal_slices.R
index 63ba6f9b9..ac2e451c4 100644
--- a/tests/testthat/test-teal_slices.R
+++ b/tests/testthat/test-teal_slices.R
@@ -21,8 +21,6 @@ testthat::test_that("teal_slices checks arguments", {
   testthat::expect_error(teal_slices(fs1, fs2, count_type = c("all", "none")))
 
   testthat::expect_error(teal_slices(fs1, fs2, allow_add = NULL), "Assertion on 'allow_add' failed")
-
-  testthat::expect_error(teal_slices(fs1, fs1, fs2), "Some teal_slice objects have the same id")
 })
 
 testthat::test_that("teal_slices returns `teal_slices`", {
@@ -45,6 +43,24 @@ testthat::test_that("teal_slices returns `teal_slices`", {
   testthat::expect_length(teal_slices(fs1, fs2), 2L)
 })
 
+testthat::test_that("teal_slices accepts duplicated elements if they have identical values", {
+  ts1 <- teal_slice(dataname = "ds1", varname = "var1", id = "slice1")
+  ts2 <- teal_slice(dataname = "ds1", varname = "var1", id = "slice1")
+
+  testthat::expect_no_error(teal_slices(ts1, ts2))
+})
+
+testthat::test_that("teal_slices throw an error if elements with duplicated id have different settings", {
+  ts1 <- teal_slice(dataname = "ds1", varname = "var1", id = "slice1")
+  ts2 <- teal_slice(dataname = "ds1", varname = "var2", id = "slice1")
+
+  testthat::expect_error(
+    teal_slices(ts1, ts2),
+    "Conflicting `teal_slice` objects id. Items have the same id but their settings differ:\nslice1"
+  )
+})
+
+
 testthat::test_that("teal_slices raises error when include_varnames and exclude_varnames specified same dataset", {
   testthat::expect_error(
     teal_slices(
@@ -266,6 +282,7 @@ testthat::test_that("c.teal_slices concatenates `teal_slices` objects", {
   testthat::expect_length(c(fss1, fss2), length(fss1) + length(fss2))
 })
 
+
 testthat::test_that("c.teal_slices coalesces attributes", {
   fs1 <- teal_slice("data1", "var1")
   fs2 <- teal_slice("data1", "var2")